﻿using System;

class NullValuesArithmetic
{
    static void Main()
    {
        int? someInteger = null;
   
        double? someDouble = null;

        Console.WriteLine("This is the integer number with Null value --> " + someInteger);
        Console.WriteLine("This is the double number with Null value --> " + someDouble);
        someInteger += 7;
        someDouble += 1.99;
        Console.WriteLine("This is the integer number with Null value, after we added some value --> " + someInteger);
        Console.WriteLine("This is the double number with Null value, after we added some value --> " + someDouble);
    }
}